Safety attachment for elevators.



L. LEWANDOWSKI.

SAFETY ATTACHMENT FOR ELEVATORS.

:II i l lll l I r Batented Mar. 6, 1917.

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L. LEWANDOWSKI. SAFETY ATTACHMENT FOR ELEVATORS.

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SAFETY ATTACHMENT FOR ELEVATORS.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed December 26, 1916. Serial No. 138,885. I

To all whom it may concern:

Be it known that I, LEON LEWANDOWSKI, citizen of the United States, residing at De troit, county of Wayne, State of Michigan, have invented a certain new and useful-Improvement in Safety Attachments for Elevators, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to an improvement in safety devices for elevators, shown in the accompanying drawings and more particularly described in the following specification and claims.

One of the objects of this invention is to provide an attachment for elevators which is adapted to become instantly operative to prevent the elevator falling in the event of the hoisting cable breaking or slackening.

Another object of the invention is simplicity of construction and operation, and minimum cost of installation.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention as shown may be made without departing from the spirit of the same.

In the accompanying drawings forming part of this specification,

Figure 1 is an elevation of an elevator and its guide rails, with parts in section,- showing the safety attachment installed.

Fig. 2 is a fragmentary plan view of an elevator, with its guide rails in section, showing the safety attachment in position.

Fig. 3 is a sectional elevation of the ele vator and side rails, at right angles to Fig. 1.

Fig. A is a detail view showing the eccentric toothed wheel and cooperating elements, with parts in section.

Fig. 5 is a sectional detail through the sprocket wheel and cable drum.

Referring now to the letters of reference placed upon the drawings,

A, denotes an elevator, comprising the usual platform A, vertical frame A and cross-member A B, is a hoisting cable, extending loosely through a fitting O, bolted to the cross member A and attached to a cable drum D, below the cross member.

I C, and C are nuts or stops secured in spaced relation to each other upon the cable, to limit the movement of the latter through the fitting C.

The cable drum D, is sleeved on a shaft D, squared at its end (as indicated at (Z) to secure it against rotation in the supporting frame d.

E, is a coiled spring sleeved upon the shaft D, one end of which is secured to the shaft, the other end being attached to the ratchet wheel D carried by the cable drum. D is a dog pivoted to the frame of the elevator adapted to engage the teeth of the ratchet Wheel D when initially putting the coil spring under tension, as will be hereinafter described.

F, indicates a plurality of mutilated toothed wheels, eccentrically mounted on stub shafts F, carried by the elevator frame. Gr, denotes a spring sleeved over the respective shafts F, having one. end secured to the toothed wheel carried thereby ;-the other end being engaged tov the elevator frame. H, denotes a rack bar (with which the toothed wheels F, are normally out of mesh) bolted to the respective guide rails H, on each side of the elevator well.

I, indicates a plurality of cables leading from the drum D,passing therefrom over pulleys I, and connected respectively with the several eccentrically mounted toothed leased from the sprocket wheel, whereupon the cable, coiled upon and connected with the drum, serves to retain the spring E, under tension, unless released by the cable breaking or becoming slackened.

When operating regularly the nut G at- Wheels F, are thus slackened releasing the respective springs G, controlling the rotation of the eccentric toothed wheels F, which under the action of the springs are caused to rotate into mesh with the teeth of the rack bars H, with which they bind due to the eccentric mounting of the wheels,thereby stopping a further descent of the elevator.

Having thus described my invention What I claim is 1. In an elevator, the combination with a car, its guide rails and hoisting cable, of rack bars secured to the guide rails, a plurality of eccentric mutilated gears j ournalecl in said car and normally out of mesh with the rack bars, springs adapted for rotating the gears into mesh with the rack bars, a rotatable drum journaled in the car on which the end of the hoisting cable is wound and to which it is connected, a spring adapted to rotate said drum against the action of the cable upon the hoisting cable being broken, a fitting bolted to the car through which the hoisting cable is free to move,

means secured to the cable on each side of the fitting to limit the movement of the 5,,

cable through the fitting, other cables wound upon the drum and severally connected with the gears, whereby the latter may be maintained against the action of their respective controlling springs out of mesh with the teeth of the rack bar until released by the breaking of the hoisting cable.

2. In an elevator, the combination with the car, its guide rails, and hoisting cable, of

rack bars secured to the guide rails, a plu- 1 rality of eccentric gears journaled in the car and normally out of mesh with the rack bar, springs for forcing said gears in meshed binding relation with the rack bars, a

spring actuated drum fitted with a ratchet gear and journaled in the car to which the hoisting cable is connected, a dog to initially engage the gear against the action of the spring, and other cables wrapped upon said drum and connected with,the gears, to maintain them out of mesh with the rack bars against the action of their controlling springs until released by the breaking of the hoisting cable.

In testimony whereof, I sign this specification in the presence of two witnesses.

LEON LEWAND OVVSKI.

Witnesses:

A. S. FIJALKoWsKI, S. E. THOMAS.

'Copies of this patentmay be obtained for five cents each, by addressing. the Commissioner of Patents,

- Washington, D. C. 

